Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2004-11-10
2009-06-23
Feild, Joseph (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
Reexamination Certificate
active
07551527
ABSTRACT:
An offset calibration system of a control loop at least comprises an optical-to-electrical converter and an electrical-to-optical converter. The optical-to-electrical converter generates a pre-output signal and then transmits the pre-output signal to the electrical-to-optical converter to amplify. The offset calibration system comprises a comparator, an offset calibration module, and a determination circuit. The comparator compares the pre-output signal with a predetermined pre-reference signal to generate a pre-compared signal. The offset calibration module stores a predetermined and adjustable offset calibration value for adding to the pre-output signal. The determination circuit adjusts the offset calibration value based on the pre-compared signal, so the offset calibration value can be added to the pre-output signal dynamically to compensate and calibrate the offset of the pre-output signal caused by the optical-to-electrical converter to avoid the electrical-to-optical converter amplifying the offset of the pre-output signal again.
REFERENCES:
patent: 5251194 (1993-10-01), Yoshimoto et al.
patent: 5289447 (1994-02-01), Kobayashi et al.
patent: 5559772 (1996-09-01), Takeda
patent: 7317673 (2008-01-01), Yu
Agustin Peter Vincent
Feild Joseph
MediaTek Inc.
Patterson & Sheridan LLP
Taboada Keith P.
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